How can I automatically create system accounts for network users connecting to a Samba server?

While joining a Samba server to the domain does alleviate the server's need to have local Samba passwords set, Samba still must have a local system user to map a connecting network user to. This is necessary in order for Samba to determine whether to grant or deny access to the resources requested by the connecting user, based on the mapped local user's uid and group memberships, as well as th...