Since I am being called, here are my 2 cents 
Dividend taxation rules for French tax residents are described here on the French tax authorities’ website: Fiscalité des particuliers | impots.gouv.fr
Specifically, and again I am directly quoting the tax authorities: “Pour les résidents : le PFU au taux global de 30 % (12,8 % au titre de l’impôt sur le revenu et 17,2 % au titre des prélèvements sociaux) s’applique notamment sur les dividendes, les intérêts et les plus-values de cession de valeurs mobilières.”
Translated into English: For residents: a total withholding tax of 30% (12.8% related to income tax and 17.2% related to social contributions) is applied to dividends.
So tax residents in France are to expect a 30% withholding tax on dividends paid to them by French corporations.