Can I get Nautilus to show me folder details on mouse hover?
Solution 1:
Neither Thunar, PCManFM, nor Nautilus have this feature, I don't know about Dolphin as I don't have it Installed, while I think is possible they could have it they don't currently use it.
As @Tom mentioned in the comments, Gnome Sushi is the closest to have that but you need to press the Space bar for the window to show and I don't know if if it's a bug only affecting me but the Sushi window uses a Black background with black text making it useless but you can still try it.