Class Cursor (2.3.4) 

Cursor(mapping=None, *, ignore_unknown_fields=False, **kwargs)

A position in a query result set. .. attribute:: values

The values that represent a position, in the order they appear in the order by clause of a query. Can contain fewer values than specified in the order by clause.

:type: Sequence[google.cloud.firestore_v1.types.Value]

Attribute
Name Description
before bool
If the position is just before or just after the given values, relative to the sort order defined by the query.