Our friends from Guiding Tech published a tutorial which shows how to keep an eye on who is accessing your shared network files and folders. They are using a very old-school tool for the task but it doesn’t mean it doesn’t work and it is not easy to use.
The tutorial with step by step instructions can be found here: How to Monitor Access to your Shared Windows Folders & Files.
The tool can be downloaded from here: NetShareMonitor Download.
Before you download the tool, we would like to warn you that some security products will find the application’s file suspicious. We are aware of BitDefender and Comodo not being comfortable with it. Other security products might mark it as suspicious too.