Hi,
As per docs, for postgres version 9.5 , only two tablespaces options are supported "seq_page_cost and random_page_cost"
And for 9.6 , the support for "effective_io_concurrency" is also added.
The required changes are implemented in code and tested against postgresql-9.5, 9.6 & edb-ppas 9.5 and 9.6
Please find patch and review.
Thanks,
Surinder Kumar