Two things:

1.
A long while ago the APFS team at Apple asked for input on what's needed -
I then asked for fast catalog search support, in the ways of the searchfs
BSD function. Has anything happened in that direction?

2.
And then there's a possible issue around reporting support for this
operation (as of 10.13 beta 2):

My search tool unsuccessfully attempts to use FSCatalogSearch on APFS
volumes because it's being told by the API that the APFS volume supports
that operation. Which it doesn't do, though, as my app then gets no results
from the search. I haven't been able to look deeper into this yet, I get
this from customer reports that all have the same problem now after
installing High Sierra and upgrading to APFS.

So, could it be that the volume flags are incorrectly set, indicating that
the file system supports CatalogSearch even though it doesn't? (I'm just
throwing this in as early as possible, but I'll make sure to file a bug
report should my suspicion be confirmed).

-- 
Thomas Tempelmann, http://www.tempel.org/
Follow me on Twitter: https://twitter.com/tempelorg
Read my programming blog: http://blog.tempel.org/
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