CAN.filter(...) has no effect

A big sorry!! It was my mistake. Phease delete or ignore this unnecessary post.

The CAN.filter (...) function for MCP2515 definitely does not work! It is not filtered, all messages arrive.
Here are some long discussions about filters with no helpful results. Why is the error (?) not corrected?
arduino-CAN is an official Arduino library! And it should work without ifs and buts.