Local groups are groups of domain and/or local users that grant additional privileges to those users.
SMB Local Groups:
Administrators - Administrators can bypass file permissions to change the ownership on files.
Backup Operators - Backup Operators can bypass file access controls to backup and restore files.
hostname:configuration services smb> groups
hostname:configuration services smb groups> create
hostname:configuration services smb member (uncommitted)> set user=Bill
hostname:configuration services smb member (uncommitted)> set group="Backup Operators" hostname:configuration services smb member (uncommitted)> commit
hostname:configuration services smb groups> list MEMBER USER GROUP member-000 WINDOMAIN\Bill Backup Operators