may be bug in svn fetch no-follow-parent

Why git svn fetch try to handle mergeinfo changes when no-follow-parent is enabled? Git try to follow parents regardless of this option value. If branch created without this option then git will follow parent succesfully If branch created with this option then git try to follow and fail with "cannot find common ancestor" error If branch does not exists (ignored) then git try to follow and fail with "couldn't find revmap" error. It is very long operation