[Toybox] Stat %Z - What are valid values?

[darken]

I've seen a value of "18446744072363093454" for stat %Z (seconds since
epoch), for some files on a users device (Android 6.01).

This seems suspiciously large and I'm wondering what the valid range for
this value is.
What range is valid for the filesystem to return and what value range can
toybox handle?

~Matthias
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