[Samba] smbusers and root privs

[reader at newsguy.com]

Running samba-3.0.23c on Genoo linux

Is it possible with smbusers to allow a windows user to have root
privleges on a linux share?

A stock install of samba on Gentoo ends up with an /etc/samba/smbusers
file that contains this mapping:
  root = administrator admin

It appears then that other windows users could as well be mapped to
root like:
  root = administrator admin harry

and since I am the only user on either linux or windows on this home
network I'd like to map windows user harry to root but the above
example does not accomplish that.

Is there something else required?