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AFAIK, on Solaris and Illumos systems the zfs stats are exposed via kstats - a generic stats framework used by the kernel to export all sorts of kernel stats to userspace. This is totally unrelated to libzfs. Since Linux doesn't have kstats, I don't know how these stats are exported to userspace.
On Illumos with two pools (rpool & storage):
$ kstat -p zfs:::
zfs:0:arcstats:anon_evictable_data 0
zfs:0:arcstats:anon_evictable_metadata 0
zfs:0:arcstats:anon_size 425984
zfs:0:arcstats:arc_meta_limit 2537575424
zfs:0:arcstats:arc_meta_max 222719568
zfs:0:arcstats:arc_meta_min 634393856
zfs:0:arcstats:arc_meta_used 222672800
zfs:0:arcstats:c 10150301696
zfs:0:arcstats:c_max 10150301696
zfs:0:arcstats:c_min 1268787712
zfs:0:arcstats:class misc
zfs:0:arcstats:crtime 13.066910337
zfs:0:arcstats:data_size 732880384
zfs:0:arcstats:deleted 17
zfs:0:arcstats:demand_data_hits 204922
zfs:0:arcstats:demand_data_misses 7025
zfs:0:arcstats:demand_metadata_hits 353788
zfs:0:arcstats:demand_metadata_misses 34908
zfs:0:arcstats:duplicate_buffers 0
zfs:0:arcstats:duplicate_buffers_size 0
zfs:0:arcstats:duplicate_reads 0
zfs:0:arcstats:evict_l2_cached 0
zfs:0:arcstats:evict_l2_eligible 135680
zfs:0:arcstats:evict_l2_ineligible 2048
zfs:0:arcstats:evict_l2_skip 0
zfs:0:arcstats:evict_not_enough 0
zfs:0:arcstats:evict_skip 2375
zfs:0:arcstats:hash_chain_max 1
zfs:0:arcstats:hash_chains 127
zfs:0:arcstats:hash_collisions 206
zfs:0:arcstats:hash_elements 20890
zfs:0:arcstats:hash_elements_max 20954
zfs:0:arcstats:hdr_size 4717728
zfs:0:arcstats:hits 565560
zfs:0:arcstats:l2_abort_lowmem 0
zfs:0:arcstats:l2_asize 0
zfs:0:arcstats:l2_cdata_free_on_write 0
zfs:0:arcstats:l2_cksum_bad 0
zfs:0:arcstats:l2_compress_failures 0
zfs:0:arcstats:l2_compress_successes 0
zfs:0:arcstats:l2_compress_zeros 0
zfs:0:arcstats:l2_evict_l1cached 0
zfs:0:arcstats:l2_evict_lock_retry 0
zfs:0:arcstats:l2_evict_reading 0
zfs:0:arcstats:l2_feeds 0
zfs:0:arcstats:l2_free_on_write 0
zfs:0:arcstats:l2_hdr_size 0
zfs:0:arcstats:l2_hits 0
zfs:0:arcstats:l2_io_error 0
zfs:0:arcstats:l2_misses 0
zfs:0:arcstats:l2_read_bytes 0
zfs:0:arcstats:l2_rw_clash 0
zfs:0:arcstats:l2_size 0
zfs:0:arcstats:l2_write_bytes 0
zfs:0:arcstats:l2_writes_done 0
zfs:0:arcstats:l2_writes_error 0
zfs:0:arcstats:l2_writes_lock_retry 0
zfs:0:arcstats:l2_writes_sent 0
zfs:0:arcstats:memory_throttle_count 0
zfs:0:arcstats:metadata_size 172011520
zfs:0:arcstats:mfu_evictable_data 294233600
zfs:0:arcstats:mfu_evictable_metadata 11375104
zfs:0:arcstats:mfu_ghost_evictable_data 0
zfs:0:arcstats:mfu_ghost_evictable_metadata 0
zfs:0:arcstats:mfu_ghost_hits 0
zfs:0:arcstats:mfu_ghost_size 0
zfs:0:arcstats:mfu_hits 428190
zfs:0:arcstats:mfu_size 309649408
zfs:0:arcstats:misses 49514
zfs:0:arcstats:mru_evictable_data 438646784
zfs:0:arcstats:mru_evictable_metadata 73229824
zfs:0:arcstats:mru_ghost_evictable_data 0
zfs:0:arcstats:mru_ghost_evictable_metadata 0
zfs:0:arcstats:mru_ghost_hits 0
zfs:0:arcstats:mru_ghost_size 0
zfs:0:arcstats:mru_hits 130520
zfs:0:arcstats:mru_size 594816512
zfs:0:arcstats:mutex_miss 0
zfs:0:arcstats:other_size 45943552
zfs:0:arcstats:p 5075150848
zfs:0:arcstats:prefetch_data_hits 40
zfs:0:arcstats:prefetch_data_misses 2351
zfs:0:arcstats:prefetch_metadata_hits 6810
zfs:0:arcstats:prefetch_metadata_misses 5230
zfs:0:arcstats:size 955553184
zfs:0:arcstats:snaptime 797.095073772
zfs:0:rpool:class disk
zfs:0:rpool:crtime 13.613081594
zfs:0:rpool:nread 300412928
zfs:0:rpool:nwritten 46036992
zfs:0:rpool:rcnt 0
zfs:0:rpool:reads 11623
zfs:0:rpool:rlastupdate 792236607667
zfs:0:rpool:rlentime 11567533720
zfs:0:rpool:rtime 4103293101
zfs:0:rpool:snaptime 797.095381801
zfs:0:rpool:wcnt 0
zfs:0:rpool:wlastupdate 792236544998
zfs:0:rpool:wlentime 95630219701
zfs:0:rpool:writes 3406
zfs:0:rpool:wtime 1361647235
zfs:0:storage:class disk
zfs:0:storage:crtime 13.773738155
zfs:0:storage:nread 114585600
zfs:0:storage:nwritten 109811200
zfs:0:storage:rcnt 0
zfs:0:storage:reads 8059
zfs:0:storage:rlastupdate 796584315130
zfs:0:storage:rlentime 4969686426
zfs:0:storage:rtime 3408945696
zfs:0:storage:snaptime 797.095431242
zfs:0:storage:wcnt 0
zfs:0:storage:wlastupdate 796584023740
zfs:0:storage:wlentime 35066891661
zfs:0:storage:writes 9412
zfs:0:storage:wtime 1092824960
zfs:0:vdev_cache_stats:class misc
zfs:0:vdev_cache_stats:crtime 13.066934950
zfs:0:vdev_cache_stats:delegations 0
zfs:0:vdev_cache_stats:hits 0
zfs:0:vdev_cache_stats:misses 0
zfs:0:vdev_cache_stats:snaptime 797.095348176
zfs:0:xuio_stats:class misc
zfs:0:xuio_stats:crtime 13.051310423
zfs:0:xuio_stats:onloan_read_buf 0
zfs:0:xuio_stats:onloan_write_buf 0
zfs:0:xuio_stats:read_buf_copied 0
zfs:0:xuio_stats:read_buf_nocopy 0
zfs:0:xuio_stats:snaptime 797.095024276
zfs:0:xuio_stats:write_buf_copied 0
zfs:0:xuio_stats:write_buf_nocopy 566
zfs:0:zfetchstats:bogus_streams 0
zfs:0:zfetchstats:class misc
zfs:0:zfetchstats:colinear_hits 27
zfs:0:zfetchstats:colinear_misses 474862
zfs:0:zfetchstats:crtime 13.062448407
zfs:0:zfetchstats:hits 376780
zfs:0:zfetchstats:misses 474889
zfs:0:zfetchstats:reclaim_failures 473845
zfs:0:zfetchstats:reclaim_successes 1017
zfs:0:zfetchstats:snaptime 797.095047105
zfs:0:zfetchstats:streams_noresets 3413
zfs:0:zfetchstats:streams_resets 26
zfs:0:zfetchstats:stride_hits 373367
zfs:0:zfetchstats:stride_misses 1737
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