support for rfc3339 nano

[tg123]

#1350

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@3edf256). Click here to learn what that means.
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@@            Coverage Diff            @@
##             master    #1351   +/-   ##
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[tg123]

ping @brendanburns for approval

[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anekdoti, brendandburns, ndallmeyer, tg123

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• OWNERS [brendandburns,tg123]

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