finds spike containers in multi spike containers collection offspring

def find(self,cell_designation,cell_filter=lambda x,c: 'c' in x and x['c'] == c):
        """
            finds spike containers in multi spike containers collection offspring
        """
        if 'parent' in self.meta:
            return (self.meta['parent'],self.meta['parent'].find(cell_designation,cell_filter=cell_filter))