Calibre gui configuration
From wikinotes
Sharing Library
Sharing a library (ex: NFS) isn't officially supported.
Use the calibre web server instead.You used to be able to work around it, and mount it like this.
//192.168.1.111/books /mnt/books cifs auto,_netdev,users,nobrl,dir_mode=0777,file_mode=0664,gid=smbshare,x-systemd.automount 0 0