docs: Document limitation regarding subpaths
Subpaths are not supported at the moment. Document that fact.
Fixes:
* [Support for joining an existing VM network](#support-for-joining-an-existing-vm-network)
* [docker --net=host](#docker---nethost)
* [docker run --link](#docker-run---link)
+ * [Storage limitations](#storage-limitations)
+ * [Kubernetes `volumeMounts.subPaths`](#kubernetes-volumemountssubpaths)
* [Host resource sharing](#host-resource-sharing)
* [docker run --privileged](#docker-run---privileged)
* [Miscellaneous](#miscellaneous)
@@ -216,6 +218,17 @@ Equivalent functionality can be achieved with the newer docker networking comman
See more documentation at
[docs.docker.com](https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/).
+## Storage limitations
+
+### Kubernetes `volumeMounts.subPaths`
+
+Kubernetes `volumeMount.subPath` is not supported by Kata Containers at the
+moment.
+
+See [this issue](https://github.com/kata-containers/runtime/issues/2812) for more details.
+[Another issue](https://github.com/kata-containers/kata-containers/issues/1728) focuses on the case of `emptyDir`.
+
+
## Host resource sharing
### docker run --privileged
