6979526: (file) java/nio/file/FileStore/Basic.java fails if the same file system is mounted more than once
Reviewed-by: kevinw, forax

Reviewed-by: darcy, weijun

6873621: (file) FileStore.supportsFileAttributeView(Class<FileAttributeView> type) returns wrong result
Reviewed-by: andrew

6844313: New I/O: File timestamps should be represented by a FileTime rather than a long+TimeUnit
Reviewed-by: sherman

4313887: New I/O: Improved filesystem interface
4607272: New I/O: Support asynchronous I/O
Reviewed-by: sherman, chegar