fs: validate statfs path #1950

Job	Run time
Build slim tarball	1m 30s
aarch64-darwin: with shared libraries	24m 10s
x86_64-linux: with shared libraries	29m 6s
x86_64-darwin: with shared libraries	45m 15s
aarch64-linux: with shared libraries	23m 26s
	2h 3m 27s

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