Do you set the acltype to posix or leave default nfsv4 ?
I think Windows ACLs may even predate Posix ACLs. Remember, the Windows NT development was started by hiring a lot of people from Digital's VMS group, and NT got its own file system NTFS. The VMS file system has extensive ACLs (which I used to use), and that tradition was carried forward into NTFS, and from there into SMB and CIFS. I think the Posix committee ACLs came relatively late, in the late 90s, when there were already ACLs in production in various other file systems such as NTFS.I suppose Windows does not implement posix acls but its own version ?