Yes, that's the behavior I have implemented in Wireshark and our internal 
tools. 

--scott

> On Jan 5, 2017, at 8:52 PM, Guy Harris <g...@alum.mit.edu> wrote:
> 
>> On Jan 5, 2017, at 8:48 PM, Scott Deandrea <sdeand...@apple.com> wrote:
>> 
>> The mach absolute time base is different between ARM and x86/x64 though 
>> developers won’t have access to packet capture on iOS devices (internally 
>> the packet capture is used on iOS devices).  The developers that would be 
>> using this software capture are familiar with the Mach Absolute Time format 
>> as it is the same values returned by the real software stack so I don’t see 
>> any need to change the format to nanoseconds.
> 
> ...so a Wireshark dissector, or tcpdump printer, for these packets would 
> presumably just show the time stamps as a raw 64-bit value, without any 
> interpretation, and leave it up to the person reading the capture to 
> interpret it.
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