I think its this line in your config.
ignore_fs = ["tmpfs", "devtmpfs", "devfs", "iso9660", "overlay", "aufs", "squa shfs"]
"squa shfs" is probably also ignoring fuse.shfs
Ah, now I understand what you meant. Have you looked at the libvirt telegraf plugin?
Edit: nvm, doesnt look like it exits yet. Just a PR on their repo.
As long as the vm has telegraf installed and sends data to the same influx database, you should only need to change the host in the drop down. In theory atleast