class_docstr: Creates a Feature Group that adds its child layers into a parent group when
  added to a map (e.g. through LayerControl). Useful to create nested groups,
  or cluster markers from multiple overlays. From [0].
  
  [0] https://github.com/ghybs/Leaflet.FeatureGroup.SubGroup
  
  Parameters
  ----------
  group : Layer
      The MarkerCluster or FeatureGroup containing this subgroup.
  name : string, default None
      The name of the Layer, as it will appear in LayerControls
  overlay : bool, default True
      Adds the layer as an optional overlay (True) or the base layer (False).
  control : bool, default True
      Whether the Layer will be included in LayerControls.
  show: bool, default True
      Whether the layer will be shown on opening.
  
  Examples
  -------
  
  Nested groups
  =============
  >>> fg = folium.FeatureGroup()  # Main group
  >>> g1 = folium.plugins.FeatureGroupSubGroup(fg, "g1")  # First subgroup of fg
  >>> g2 = folium.plugins.FeatureGroupSubGroup(fg, "g2")  # Second subgroup of fg
  >>> m.add_child(fg)
  >>> m.add_child(g1)
  >>> m.add_child(g2)
  >>> g1.add_child(folium.Marker([0, 0]))
  >>> g2.add_child(folium.Marker([0, 1]))
  >>> folium.LayerControl().add_to(m)
  
  Multiple overlays part of the same cluster group
  =====================================================
  >>> mcg = folium.plugins.MarkerCluster(
  ...     control=False
  ... )  # Marker Cluster, hidden in controls
  >>> g1 = folium.plugins.FeatureGroupSubGroup(mcg, "g1")  # First group, in mcg
  >>> g2 = folium.plugins.FeatureGroupSubGroup(mcg, "g2")  # Second group, in mcg
  >>> m.add_child(mcg)
  >>> m.add_child(g1)
  >>> m.add_child(g2)
  >>> g1.add_child(folium.Marker([0, 0]))
  >>> g2.add_child(folium.Marker([0, 1]))
  >>> folium.LayerControl().add_to(m)
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code: def __init__(
      self, group, name=None, overlay=True, control=True, show=True
  ):
      super().__init__(
          name=name, overlay=overlay, control=control, show=show
      )
  
      self._group = group
      self._name = "FeatureGroupSubGroup"
  
imports: from jinja2 import Template
  from folium.elements import JSCSSMixin
  from folium.map import Layer
label_desc: Use image node_id 1 to create a new FeatureGroupSubGroup object from inherited base classes: JSCSSMixin, Layer with example: obj = FeatureGroupSubGroup(group, name, overlay, control, show)