fs: validate statfs path #2008

Job	Run time
Build slim tarball	1m 29s
aarch64-darwin: with shared libraries	24m 36s
x86_64-linux: with shared libraries	29m 39s
aarch64-linux: with shared libraries	23m 54s
x86_64-darwin: with shared libraries	40m 51s
	2h 0m 29s

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