Jeff Layton [off-list ref] wrote:

Correct. We'd lose some fidelity in currently stored timestamps, but as
Linus and Ted pointed out, anything below ~100ns granularity is
effectively just noise, as that's the floor overhead for calling into
the kernel. It's hard to argue that any application needs that sort of
timestamp resolution, at least with contemporary hardware. 

Albeit with the danger of making Steve French very happy;-), would it make
sense to switch internally to Microsoft-style 64-bit timestamps with their
100ns granularity?

David