Add support for mount manager #4568
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See PR containerd/containerd#7839 and commit 34d587818596 ("Use mount.Target to specify subdirectory of rootfs mount") for more details. Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
So that
$ nerdctl run --snapshotter=erofs -it --rm docker.1ms.run/library/nginx:latest /bin/sh
can work now instead of erroring out as:
```
FATA[0000] failed to mount {Type:format/mkdir/overlay Source:overlay Target: Options:[lowerdir={{ overlay 0 6 }}]} on "/tmp/initialC2844197147": mount source: "overlay", target: "/tmp/initialC2844197147", fstype: format/mkdir/overlay, flags: 0, data: "lowerdir={{ overlay 0 6 }}", err: no such device
```
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
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generateMountOpts() needs to be adapted since it duplicates some client code.
tested with erofs snapshotter and runC:
