I don't use Samba shares myself, but I'm pretty sure I have read here (numerous times) that the newer builds require a Samba password.
If you are not using Samba passwords then the obvious fix would seem to be to start doing so (or use a different method of file access by your media box)
Ok, but as you can see mounts can be made to a windows10 machine without the need of a password. As I interpret this, it's a limitation in Kodi, the way it does the mounting stuff. It has nothing to do with samba versions, because the mounts do work if you make them at Linux level.
It's also strange smb browsing doesn't work at all in the 8.2 LE. In the older version, I could simply browse my network and every samba share (both windows and unix like) would pop up, and I could add them to my list like that.
I can make mounts to my Linux server and Dreamboxes without any problem. Only Windows 10 does not work.
I also played with the maximum smb version setting, it doesn't make any difference.
ps. an account with password also fixes the problem, but I still can't browse for smb shares.
I use advanced sharing in Windows 10, I just added an account called kodi with password with read only access to my share permissions.