Monitor the network shared folder? [closed]

I am looking for freeware/open source application which can monitor the shared folder on local network. I did use some freeware application , but forgot its name.

I Would like to see who are all currently using that particular folder and even get notified when changes happen.

If you're looking for a tool to alert you when someone is accessing your shared folders, see this article:
Monitor and Notify when Shared Folders being Accessed

Or this article for a tool that can tell what file the user is actually accessing and can log it down for future reference:
Track Who Modified or Deleted Files in Your Shared Folder