One of the nifty tools that was of great help during the Samba journey was "net", a tool for administration of Samba and remote CIFS servers.The samba net utility is meant to work just like the net utility available for windows and DOS.
For example to map a NT group (Domain Admins) to a Unix group (root),we can do a
net groupmap modify netgroup="Domain Admins" unixgroup=root
To list the mapped groups, the command is,
net groupmap list