Hello, I have file "file" with ownership "student.teacher": -rw-rw---- 1 student teacher xx Dec 28 2005 file . I need to disallow user student to change the group for the file "file" (or whole file/dir tree). I think somewhere could be vfs module for it but I'm unable to find it. Or is there another way to do it? server - linux (debian stable) + samba 3.0.14 from debian stable clients - winxp, linux + smbmount Thanks for help Luf