SGID inheritance in different file-systems

[Vasily Isaenko <vasily.isaenko@xxxxxxxxxx>]

Dear XFS Members,

In the XFS test suite there is a test case generic/314 "Test SGID 
inheritance on subdirectories".
It is not specific to a particular filesystem thus selected for both xfs 
or ext4 test runs.
In other words, the same behaviour is expected and enforced for XFS and 
EXT4.
However, I have been told that EXT4 and XFS may have different behaviour 
as the
setgid-directory behavior is not guaranteed to work the same way on all 
filesystems.
Shall XFS test case reflect that difference or enforcing the same 
behaviour is appropriate?
Best regards,
Vasily