Domain groups and admins

[Bic]

Hello!

In man about smb.conf(5) i have found that there  is a possibility
to create domain groups and users... But else that possibilities there were nothing.
And link points to samba-ntdom at samba.org
I decided to ask where can i find examples  ot something else about domain groups and users creating? NT User Manager for Domain prints errors when i try to
add user to some groups...