Incorrect. FreeBSD was in use first, as founder David Young’s own history [1] describes. OpenSolaris and zones came later.
[1]: https://www.google.co.uk/amp/s/davidpaulyoung.com/2016/06/17...
[1]: https://www.google.co.uk/amp/s/davidpaulyoung.com/2016/06/17...
Nope. Solaris Zones.