SELinux blocking Samba access to mounted volume despite samba_share_t
Solution 1:
The audit log entry says your mount point /media/raid0 doesn't have an SELinux label. Nevermind the nas directory, it can't get that far!
You'll need to set an appropriate SELinux context for /media/raid0. Restoring the default context mnt_t should be sufficient.
restorecon -v /media/raid0