AndSMB (samba client) by LYSESOFT is the best Samba client for Android, which let you access shared folders hosted on Windows or Samba servers over Wifi/3G. After configured and mounted the shared things with authentication, the file browser allows you to rename, delete, create folders, open, download and upload local and remote files, even synchronize folders.
I have tested AndSMB on my Nexus 7. When I copy or sync movie files from SMB to the tablet via WiFi, I note that the speed is very slow and it randomly fails. It is not very good but works.