[Samba] How to modify ACLs from Mac OS X Clients (Win clients work fine)

[Bruce Martin]

Hi there - I have managed to set up an ACL based Samba share on a
linux server.  It's a simple setup: no PDC, no LDAP, no UID/GID
mapping etc.

The server name is REUBEN

>From my Windows machines, I can right click on a file, and add acl
entries by choosing usernames on the server like this: REUBEN\username

However, I can't find any way to do this on Mac OS X? Anyone done this before?

Thanks
 Bruce