snapshot send with parent question

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Assume the following scenario:
There exists a read-only snapshot called a.
A read-write snapshot called b is created from a, and is then modified.
A read-only snapshot of b is created, called c.
A btrfs send is done for c, with a marked as its parent.

Will the send data only contain the differences between a and c?  My
experiments seem to indicate no, but I have no confidence that I am not
doing something else correctly.

Also, when a btrfs receive gets a stream containing the differences
between a (parent) and c, does it only look at the relative pathname
differences between a and c in order to determine the matching parent on
the receiving side?

-- 
Michael Welsh Duggan
(md5i@xxxxxxxx)

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