--guestmount=<path>::
	Guest OS root file system mount directory. Users mount guest OS
	root directories under <path> by a specific filesystem access method,
	typically, sshfs.
	For example, start 2 guest OS, one's pid is 8888 and the other's is 9999:
[verse]
	$ mkdir \~/guestmount
	$ cd \~/guestmount
	$ sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/
	$ sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/
	$ perf {GMEXAMPLECMD} --guestmount=~/guestmount {GMEXAMPLESUBCMD}
