Fix DirEntryInner::is_same_file at a mountpoint (#333) #1616

Job	Run time
Check Cross-Compilation on Rust nightly on Windows (nightly)	2m 3s
Check Cross-Compilation on Windows (stable)	2m 3s
Check Cross-Compilation (stable)	2m 13s
Check Cross-Compilation on Windows (beta)	1m 56s
Check Cross-Compilation on Rust nightly (nightly)	2m 25s
Check Cross-Compilation (beta)	2m 24s
Fuzz Targets	1m 18s
Rustfmt	15s
Test (stable)	42s
Test linux-raw support (ubuntu)	46s
Test (msrv)	5m 10s
Test on Musl (ubuntu)	1m 3s
Test (windows-latest)	42s
Test linux-raw support (ubuntu-20.04)	45s
Test (windows-2019)	47s
Test (macos-latest)	53s
Test with Rust nightly (ubuntu)	45s
Test (macos-11)	59s
Test with Rust nightly (windows)	2m 8s
Test (beta)	42s
Test (ubuntu-20.04)	45s
Test (aarch64-ubuntu)	58s
	31m 42s

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