This is what worked for me.
Changed the unRIAD server name to all caps in the Settings/Identification.
Changed the Windows 10 VM virtio Ethernet driver to virtio-win-0.1.102.iso.
With virtio-win-0.1.113.iso ethernet driver I wasn't able to see any other computers on the network.
When I changed the driver to virtio-win-0.1.102.iso ethernet driver I was able to see the NAS but it would give me a DNS error.
I spent 2 nights trying to get this to work. The registry and turning off SMBv2,3 didn't work. Also tried a bunch other things that didn't work.