It seems, that in Windows 10 /1511 the server message block (SMB) protocol version 3.11 is the standard. In Linux this protocol is supported beginning with Samba version 4.2. Most of NAS, routers etc. run under Linux, but in earlier versions.
I found in Microsoft Support the following information to disable the versions 2 and 3 of the SMB, link:
How to enable and disable SMBv1, SMBv2, and SMBv3 in Windows
To disable SMBv2 and SMBv3 on the SMB client, run the following
sc.exe config lanmanworkstation depend= bowser/mrxsmb10/nsi
sc.exe config mrxsmb20 start= disabled
To enable SMBv2 and SMBv3 on the SMB client again, run the following commands:
sc.exe config lanmanworkstation depend= bowser/mrxsmb10/mrxsmb20/nsi
sc.exe config mrxsmb20 start= auto
Run cmd.exe as administrator and insert (now in Windows 10 also with Ctrl+v like in any other application!..) the 2 commands to disable SMBv2 and SMBv3.
After a new start of windows, I could see my MyBookLive again:
To reset the suppressed protocols, see the commands above.