What abbreviates filenames in tab labels?

:he tablabel and :he setting-guitablabel both seem to suggest that set guitablabel=%N should put just the current buffer name in the tab title.

The test script I'm using is

mkdir -p /tmp/path/to/files
touch /tmp/path/to/files/file_{a,b,c}
vim -p /tmp/path/to/files/*

Which puts /t/p/t/f/file_a  /t/p/t/f/file_b  /t/p/t/f/file_c in the tab bar.

I want to implement something similar for fugitive, so I'm looking for the behaviour that controls this to implement it similarly.

Specifically, I'm looking for what controls folding all the directory elements in the path down to their first letters.

I'm sure I'm missing something obvious. Thanks.

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