samba-mirror/docs-xml/smbdotconf/security/adminusers.xml

<samba:parameter name="admin users"
                 context="S"
				 type="list"
                 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
    <para>This is a list of users who will be granted 
    administrative privileges on the share. This means that they 
    will do all file operations as the super-user (root).</para>

    <para>You should use this option very carefully, as any user in 
    this list will be able to do anything they like on the share, 
    irrespective of file permissions.</para>

</description>

<value type="default"/>
<value type="example">jason</value>
</samba:parameter>