Feature Request: du command - add option to report only on file objects owned by user/group

[Scott L Fields]

I'm looking for a convenient way to see the total space a given user 
and/or group is using in a directory path.

Currently, this can be achieved by options like "find <fsname> -user 
<user> -print0 | du --from0-files=1", but is not all that efficient for 
very large listings.

I would like to request an option in "du" to allow only file objects owned 
by a specific user and/or group be shown.