code: func (api *PublicFilterAPI) UninstallFilter(id rpc.ID) bool {
  	api.filtersMu.Lock()
  	f, found := api.filters[id]
  	if found {
  		delete(api.filters, id)
  	}
  	api.filtersMu.Unlock()
  	if found {
  		f.s.Unsubscribe()
  	}
  
  	return found
  }
docs: // UninstallFilter removes the filter with the given filter id.
  //
  // https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_uninstallfilter