[Samba] timestamp granularity

[HAT]

Apple File System Guide is released.
https://developer.apple.com/library/prerelease/content/documentation/FileManagement/Conceptual/APFS_Guide/GeneralCharacteristics/GeneralCharacteristics.html

>Nanosecond Timestamp Granularity
>
>APFS supports 1 nanosecond timestamp granularity, which improves
>upon the 1 second timestamp granularity of HFS+.

>Compatibility
>
>You can share APFS formatted volumes using the SMB network file
>sharing protocol. The AFP protocol is deprecated and cannot be
>used to share APFS formatted volumes.

NTFS supports 100ns timestamp granularity.
How many ns granularity does SMB protocol support?
How many ns granularity does Samba support?
How many ns granularity does vfs_fruit support?

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