Include nanoseconds in assertion of timestamp for NIOFileSystem tests #421

Job	Run time
Integration Tests / Linux (5.8)	12m 47s
Integration Tests / Linux (5.9)	14m 14s
Integration Tests / Linux (5.10)	13m 59s
Integration Tests / Linux (nightly-6.0)	16m 24s
Integration Tests / Linux (nightly-main)	16m 57s
Soundness / API breakage check	2m 16s
Soundness / Documentation check	2m 3s
Soundness / Unacceptable language check	2s
Soundness / License headers check	10s
Soundness / Broken symlinks check	3s
Soundness / Format check	57s
Soundness / Shell check	7s
Benchmarks / Benchmarks / Linux (5.8)	3m 1s
Benchmarks / Benchmarks / Linux (5.9)	5m 7s
Benchmarks / Benchmarks / Linux (5.10)	4m 56s
Benchmarks / Benchmarks / Linux (nightly-6.0)	6m 29s
Benchmarks / Benchmarks / Linux (nightly-main)	6m 0s
Unit tests / Unit tests / Linux (5.8)	3m 9s
Unit tests / Unit tests / Linux (5.9)	3m 21s
Unit tests / Unit tests / Linux (5.10)	3m 15s
Unit tests / Unit tests / Linux (nightly-6.0)	4m 16s
Unit tests / Unit tests / Linux (nightly-main)	4m 8s
Swift 6 Language Mode / Swift 6 language mode	51s
Cxx interop / Cxx interop / Linux (5.8)	1m 2s
Cxx interop / Cxx interop / Linux (5.9)	1m 11s
Cxx interop / Cxx interop / Linux (5.10)	1m 15s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 51s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 45s
	2h 11m 36s

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