When booting with Recovery Media which is based on Microsoft Windows 10 Fall Creators Update or Microsoft Windows Server 1709, a connection attempt to CIFS shares fails with:
You can't connect to the file share because it's not secure. This share requires the obsolete SMB1 protocol, which is unsafe and could expose your system to attack.
Your system requires SMB2 or higher. For more info on resolving this issue, see: https://go.microsoft.com/fwlink/?linkid=852747