What is VIRTFS and can I delete it?
From the file "/home/0_README_BEFORE_DELETING_VIRTFS":
The /home/virtfs directory contains critical operating system files. If you
remove /home/virtfs, or any directories under /home/virtfs, you will cause
irreparable damage to your operating system. Do not remove /home/virtfs, or any
directories under /home/virtfs, unless you have tested, up-to-date backups.
You should ignore any disk usage warnings you receive that are associated with
the /home/virtfs directory!
For more information about the /home/virtfs directory, visit the documentation