The settlement, or an abstract or copy thereof, may be filed in the registry for reference in the prescribed manner, but such filing shall not affect a purchaser from the proprietor with notice of its provisions, or entitle him to call for production of the settlement, or for any information or evidence as to its contents.

In this section “settlement” includes any deed stating who are the trustees of the settlement, and the vesting instrument, and any transfer or assent in the prescribed form taking the place, in the case of registered land, of a vesting instrument, as well as the trust instrument and any other instruments creating the settlement.