OS: Windows 10 - 64bit
To reproduce:
1. Sort items by Name
2. Switch to Details view (or Thumbnails + Details view)
3. Drag any file(s) over the parent folder item (..)
Actual behaviour (bug): Items can be moved above the parent folder item.

Expected behaviour: I think it shouldn't be possible to drag items above the parent folder item - if it's the move to parent folder option is not available - as in Thumbnails mode and in Icons mode.