Well I assume with “seeing” you mean you can not browse them. Browsing windows shares is a feature of smb1 which has been disabled for security reasons (WannaCry attack) in OSMC. Actually Windows 10 also disable it in the last update if you don’t use it for 10 days.
Anyhow you should be able to add your Windows 10 manually via network source or for more performance via fstab