Fix #2243 Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
split fs2 package from fs, as mixing up fs and fs2 is very likely to result in unmaintainable code. Inspired by containerd/cgroups#109 Fix #2157 Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>