[sigjuice]

Docker has their own xhyve derivative called hyperkit. Nested VMs are not supported https://github.com/moby/hyperkit/issues/127

[lloeki]

You can use Docker Machine and whatever backend you want, including xhyve, VirtualBox, and VMware Fusion, and enable nested virtualisation in the created machine.

[chrisgacsal]

If I am not mistaken then xhyve and hyperkit are separate projects utilizing the same Hypervisor Framework from Apple under the hood.

[lloeki]

hyperkit is a fork of xhyve, plus stuff like bridges between inotify and kqueue/fsevents, or transparent tcp port forwarding.

Hypervisor.framework is an API to execute hypervised code, to build virtualisation engines that can run unprivileged; you still have to write an actual virtual machine.