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Add not about NFS mounts for rootless data-root 

NFS mounts are not currently supported for rootless data-root so there should probably be a note about it so no one gets confused when it doesn't work.

Errors for running rootless containers when your data-root is an NFS mount look like:

```
docker: failed to register layer: ApplyLayer exit status 1 stdout:  stderr: open /root/.bash_logout: permission denied.
```
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Eli Uriegas 2021-08-03 11:35:19 -07:00 committed by GitHub
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engine/security/rootless.md
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@ -138,6 +138,7 @@ testuser:231072:65536
- `IPAddress` shown in `docker inspect` and is namespaced inside RootlessKit's network namespace.
This means the IP address is not reachable from the host without `nsenter`-ing into the network namespace.
- Host network (`docker run --net=host`) is also namespaced inside RootlessKit.
- NFS mounts as the docker "data-root" is not supported
## Install
> **Note**