added workaround for APFS file format.
[Bug #13816][ruby-core:82383]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59887 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
added workaround for APFS file format.
I changed to use unixtime for this assertion for APFS.
invalid charactor on APFS.
[Bug #13816][ruby-core:82383]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59887 b2dd03c8-39d4-4d8f-98ff-823fe69b080e