fs: validate statfs path #1959

Job	Run time
Build slim tarball	1m 37s
x86_64-darwin: with shared libraries	38m 44s
x86_64-linux: with shared libraries	28m 24s
aarch64-darwin: with shared libraries	23m 51s
aarch64-linux: with shared libraries	25m 9s
	1h 57m 45s

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