While testing out the MySQL backend, I discovered that `smbpasswd <username>`
updates extraneous columns in the database.  That's an overly expensive
operation.  Changing a password should only change the password, and the fields
associates with password expiration; yet the query is updating user SID, group
SID, username, nt fullname, profile path, dir_drive and home_dir.

Is there a reason for all the other fields being updated, even though the update
applies the same data that was originally in those columns?