HP CIFS Server 3.0d Administrator's Guide version A.02.02 (Edition 5)

Managing HP-UX File Access Permissions from Windows NT/XP/2000
Using the NT Explorer GUI to Create ACLs
Chapter 352
NOTE The List Names From field displays the source of the list of group
names. It may also show the name of your domain. Do not use the
domain list to add new ACLs.
Figure 3-4 Windows NT Explorer List Names From Field
Instead, what you need is a list of groups and users that can be
recognized by the underlying UNIX file system.
Since the actual ACLs will be UNIX file permissions or VxFS POSIX
ACLs in their final form, the only valid groups and users are UNIX
groups and users that the Samba server knows about.