IgfsLocalSecondaryFileSystemDualAsyncSelfTest.testAccessAndModificationTimeUpwardsPropagation fails flakily on master

junit.framework.AssertionFailedError: expected:<IgniteBiTuple [val1=1530089110000, val2=1530089110000]> but was:<IgniteBiTuple [val1=1530089111000, val2=1530089110000]>
	at junit.framework.Assert.fail(Assert.java:57)
	at junit.framework.Assert.failNotEquals(Assert.java:329)
	at junit.framework.Assert.assertEquals(Assert.java:78)
	at junit.framework.Assert.assertEquals(Assert.java:86)
	at junit.framework.TestCase.assertEquals(TestCase.java:253)
	at org.apache.ignite.internal.processors.igfs.IgfsDualAbstractSelfTest.testAccessAndModificationTimeUpwardsPropagation(IgfsDualAbstractSelfTest.java:1544)