Reusable component using React Redux mapStateToProps

A React component OilBarrel connected my redux store to create a container OilBarrelContainer:

// ---- component

class OilBarrel extends Component {
  render() {
     let data = this.props.data;
     ...
  }
}

// ---- container

function mapStateToProps(state) {
  let data = state.oilbarrel.data;
  ...
}

const OilBarrelContainer = connect(mapStateToProps)(OilBarrel)

// ---- reducer

const oilbarrel = (state = {}, action) => {
  let data = state.data;
}

const storeFactory = (server = false, initialState = {}) => {
    return applyMiddleware(...middleware(server))(createStore)(
        combineReducers({oilbarrel, otherReducer1, otherReducer2}),
        initialState
    )
}

I find it strange that mapStateToProps() receives the top level state object (the entire state of the application), requiring me to traverse state.oilbarrel.data, when the reducer (conveniently) only receives the branch of the state that belongs to this component.

This limits the ability to reuse this container without knowing where it fits into the state hierarchy. Am I doing something wrong that my mapStateToProps() is receiving the full state?