How to scan 'subfolders' on a NAS?

[TradenCookies]

I have a NAS on my network and would like to scan all files from my PC.  When I start Avast (free edition), setup a custom scan, browse and select the NAS and the folders, it finds the network device and share name just fine.  When I start the scan, it scans only the root, then stops.  I see no option to force scanning of subdirectories. 

Thoughts?

I'm using the latest version of Avast Free Antivirus.

[igor]

If you enable creation of the report file for the particular scan and let everything, even OK files and all errors, be included - what does the report show after you run the scan?
What if you enter a path to a particular file on that share (instead of the whole share) - what does the report show then?