MySQL datafiles on SMB3 network storage
NO!  MySQL is not designed to allow two servers to access the same databases.

Or, maybe...

If your goal is to provide redundancy for the case of server failure, then maybe you could set up a non-running MySQL on a secondary server, ready to mount the disk subsystem in the case of failure.

Consider, instead, Clustering (Galera, PXC, InnoDB Cluster).