I use stable version of Samba 3.0.14a with Debian and XFS filesystem with ACL support. There is one annoying feature of MS word programs from MS Office 95 and 97 when I use ACL. When user 'A' creates doc file, he is its owner. When user 'B' make changes in this document and saves them, he becomes its owner, but user 'A' remains in ACL list and so on. This is big problem, because XFS has only about 20 items in ACL. In my version of Samba it is possible to resolve the problem by use 'nt acl support = no', but it has several serious disadvantages. I know, that in next version I will be able to use 'inherit owner = yes', but I think, that it would be better to implement something like 'force owner' to samba for similar cases. This problem does not occur on word documents from version MS office 2000 and later. All excel dokuments on all versions MS office are OK too. It does not depend on used OS ( win NT, 2000, 2003 ).
newer Linux/Samba releases made this work better
*** Bug 6261 has been marked as a duplicate of this bug. ***