[RFC][WIP] Rewrite fuse-overlayfs in Rust #11

Job	Run time
Cross-build riscv64gc-unknown-linux-gnu	1m 41s
Cross-build aarch64-unknown-linux-gnu	1m 46s
Cross-build powerpc64le-unknown-linux-gnu	2m 3s
Cross-build s390x-unknown-linux-gnu	1m 48s
Cross-build armv7-unknown-linux-gnueabihf	1m 51s
build	27s
integration-test	-1s
release	0s
	9m 35s

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