>Requires: Docker 1.5 or later QEMU 2.0 or later Xen 4.5 and VT enabled host (for Xen support)
So... not hypervisor agnostic.
edit: I realize it may not be the most popular among the hackernews crowd, but VMware is by far, not even remotely close, the most widely deployed hypervisor in the mid to large enterprise market segment. The graph looks similar to Windows on the desktop numbers. To claim hypervisor agnostic without VMware support is like claiming your desktop app is OS agnostic but doesn't support Windows.