CLONE_NEWNS (since Linux 2.4.19), August 2002
CLONE_NEWIPC (since Linux 2.6.19), November 2006
CLONE_NEWUTS (since Linux 2.6.19)
CLONE_NEWNET (since Linux 2.6.24), January 2008
CLONE_NEWPID (since Linux 2.6.24)
CLONE_NEWUSER (since 2.6.23 / 3.8), February 2013
CLONE_NEWCGROUP (since Linux 4.6), May 2016