fs: validate statfs path #2005

Job	Run time
Build slim tarball	1m 35s
aarch64-linux: with shared libraries	24m 41s
x86_64-darwin: with shared libraries	43m 53s
aarch64-darwin: with shared libraries	26m 32s
x86_64-linux: with shared libraries	30m 24s
	2h 7m 5s

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