AFP & FTP Bandwidth Monitoring?

Is there a way to monitor FTP and AFP bandwidth on a per user basis? AFP = AppleFilesharingProtocol, and by monitor, I don't mean graphs, I mean getting raw byte counts I can use in my scripts any way I choose. I am attempting to use mod_watch to monitor virtual domain bandwidth usage, but I really want to be able to add on AFP and FTP usage for each user too, to make sure basically that people don't put sneak a huge load on my server through something thats not monitored.