PATCH: stat docs: Mention how to show nanosecond precision

[Mikael Magnusson <mikachu@xxxxxxxxx>]

This can be a little unintuitive to figure out; I ended up looking at
the source code to realize it was already implemented.

---
 Doc/Zsh/mod_stat.yo | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Doc/Zsh/mod_stat.yo b/Doc/Zsh/mod_stat.yo
index 9caed1e45a..b591d40032 100644
--- a/Doc/Zsh/mod_stat.yo
+++ b/Doc/Zsh/mod_stat.yo
@@ -118,6 +118,8 @@ formatting of the time elements.  The format string supports all of the
 zsh extensions described in
 ifzman(the section EXPANSION OF PROMPT SEQUENCES in zmanref(zshmisc))\
 ifnzman(noderef(Prompt Expansion)).
+In particular, tt(-F %s.%N) can be used to show timestamps with nanosecond
+precision if supported by the system.
 The tt(-s) option is implied.
 )
 item(tt(-g))(
-- 
2.15.1