You can add -v to the fuser command line switches – that will cause it to nicely print all the processes holding the locks. This way you can save yourself the effort of grepping through the process list.

On a related note, you can use the pgrep command to filter running processes. For example, to look at all of root’s processes, you can use:

pgrep -l -u root

-l tells pgrep to also list the process name instead of just the PID.