Support for attribute filters

[kapso]

Any plans for supporting filters - https://panko.dev/docs/attributes#filters

So something like

BlogResource.new(
  blog, 
  only: {
    blog: [:id, :content],
    comment: [:id, :text, :by_user]
  }
).serialize

[okuramasafumi]

Basically you want to the same as #326
Please refer to that answer.