Alerting on disk space

Is there a way to get the full path of the folder/file that's causing disk space on a server to fill up? Currently, I have an alert that provides the server name, volume size, volume space available, & percent volume used.

Example of an email I would receive when the alert triggers:

Volume, Total size 6.8 G  Free space 338 M Percent used 95 %

"/var" represents the directory of what's filling up, but it doesn't provide the folder or file of what's causing it to fill up.

Please provide any suggestions.