I only have the direct experience of sites who had corruption issues with Windows 10 1803 initially. Where we turned SMB caching off, 50% of them were rendered nearly unusable due to speed issues. Subsequent monthly updates to 1803 and 1809 seem to have resolved whatever Microsoft broke in SMB that was causing issues for VFP (and MS Access) users. As far as I'm aware there are no KB articles that either detail what they broke in SMB in the first place, or what they fixed. Not that I can find, anyway.