\setupreferenceformat [chapter] [default] [prefixsegments=...]
\setupreferenceformat [section] [default] [prefixsegments=...]

That seems to define the segmets when refering to a chapter or section,
but I need a dynamic way:

I want to go back to the last common ancestor,for example to refer to A.IV.3:

* from inside A.IV.4 it should just print 3,
* from inside A.V.1 it should print IV.3, and
* from inside B.I.1 it should print the full A.IV.3.
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