Return True if the process item match the current filter
        The proces item is a dict.

def is_filtered(self, process):
        """Return True if the process item match the current filter
        The proces item is a dict.
        """
        if self.filter is None:
            # No filter => Not filtered
            return False

        if self.filter_key is None:
            # Apply filter on command line and process name
            return self._is_process_filtered(process, key='name') or \
                self._is_process_filtered(process, key='cmdline')
        else:
            # Apply filter on <key>
            return self._is_process_filtered(process)