I tried Craig Wright's suggested solution No /mnt/hgfs in Ubuntu guest under VMWare Fusion to get shared folders appearing with Fusion 5 and it worked to get the folders appearing in /mnt/hgfs.
But now if I share the root folder of the Mac startup drive, opening this share in Files causes a hang at "Loading" and can eventually crash Ubuntu. The share can be accessed fine with Terminal.
It could be a Files-specific problem, not necessarily the result of the fix.
There is no problem sharing the root folder with Ubuntu 12.x in either Fusion 4 or 5