Disk performance statistics are not functional for VMs when they are hosted on Microsoft Scale-Out File Server. Specifically important is disk latency read and write, disk IOPs, bytes per read and bytes per write.
Scale-Out File Server for Application Data Overview
Deploy Hyper-V over SMB
This is the defacto enterprise architecture for Hyper-V now and should be supported. It was introduced to 2012...
Not only does it not work, but VMan actually provides bad data. Showing unrelated data stores for example.