Maintaining User Permissions on SMB Shares

[SoonerLater]

I have an SMB share ("Fam5"). The ACL allows only two users (we'll call them Supervisor and RegUser for this discussion). Processes which write to that SMB share are nearly all done by Supervisor. Supervisor has access to this SMB share and other SMB shares which RegUser cannot see or access). I keep having a problem where if Supervisor writes to Fam5, the permissions get set such so that RegUser cannot see the new files. And on the rare occasion that RegUser writes a new file there, then Supervisor can't see the file.


How can I set things so that no matter which users (Supervisor or RegUser) writes the file, the other user can always see the file?