In Build 9926 of Windows 10 Microsoft removed the ability to connect to unsecured network shares by default. For me and many others this includes Samba and NAS devices. Fortunately, you can enable the ability to connect to these shares by editing the registry.
The short version: add HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\AllowInsecureGuestAuth key, value set to 1.
The long version:
Click the Start Menu and type in regedit.
Microsoft is correct in that the better way to handle this is to protect your shares with authentication, and to use said authentication when connecting to the network resource in question. However, it’s not often that a computer sits in a void by itself. If I were to password protect these shares there are multiple processes I’ve created which would have to be updated. Legacy systems in the home, as it is.