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The EROFS differ only applies to EROFS layers which are marked by a special file `.erofslayer` generated by the EROFS snapshotter. Why it's needed? Since we'd like to parse []mount.Mount directly without actual mounting and convert OCI layers into EROFS blobs, `.erofslayer` gives a hint that the active snapshotter supports the output blob generated by the EROFS differ. I'd suggest it could be read together with the next commit. Signed-off-by: cardy.tang <zuniorone@gmail.com> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>