In order to generate reasonable notifications from kibana queries, we would need to be able to filter out special filesystems (tmpfs, cgroup, etc.), bind mounts, and remote filesystems such as NFS.
The default filesystem beat has the device name but not the statfs.f_fsid or filesystem name from /proc/mounts. It looks like this information could be added to the default metric by modifying this function. I'm not sure if this would be mergable upstream without some research into the sigar API.