The functionality is driven by the labels on the nodes & volumes. So if your bare metal setup adds the same labels to the nodes & volumes, it will work identically.

We can apply these labels automatically on GCE & AWS (or any cloudprovider that implements the appropriate interface in the code), but on bare-metal this will rely on your provisioning infrastructure (which presumably understands your racks & datacenters). You can now pass custom labels to kubelet also, so this should be as easy as dealing with physical hardware ever is!