How to view file access log (AFP) on Mac OS X Lion (10.7) server?

I want to track the files beeing uploaded and downloaded or deleted on the shares on the server by different users. There has to be some log where the Mac OS writes an entry for every file access (like upload / download / rename / delete) for each user. How can I access it? How can I filter the actions by user account? Do I have to first activate such a logging or is it activated from the first (standard) setup of the Mac OS X Lion server?