facter -v
3.14.11 (commit ed6c9052b125bee55f21f43d55f790c08ec75c1c)
facter virtual
parallels
./bin/facter -v
4.0.28
./bin/facter virtual
./bin/facter facterversion virtual
facterversion => 4.0.28
virtual => vmware
On virtualbox
facter facterversion virtual is_virtual
facterversion => 3.14.11
is_virtual => true
virtual => virtualbox
./bin/facter facterversion virtual is_virtual