A question about installing XFS filesystem support on Debian Lenny

[feiji1983 at gmail.com]

i recenttly got a NAS hard disk box which run Debian Lenny ,the linux
kernel is 2.6.29. I can install xfsprogs with apt-get , after
formatting  a partition using mkfs.xfs,  i can't mount it with command
"mount -t xfs XXX XXX" , it says "xfs" is not supported. i think i
have to install a path,but can't find one using apt-get,can any body
tell me how can i fix this problem? Thanks.