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Unlike the walking differ, which implements a generic method to accommodate all kinds of snapshotters, the EROFS differ is just implemented for EROFS and EROFS snapshotter so it can utilize the recent DiffDirChanges() [1] to avoid traversing the entire rootfs directory in order to improve `nerdctl commit` performance. Additionally, I think `baseDir` is unnecessary too (in principle, only `upperdir` is useful for OCI format convention). However, addressing this requires more work, so left as is for now. It's also useful to implement a customized Compare() method for EROFS differ so that we can dump the native EROFS-formatted blob to the content store later. [1] https://github.com/containerd/continuity/pull/145 Signed-off-by: Gao Xiang <xiang@kernel.org>