In a saucepan, combine eggs, milk, sugar and salt. Cook over medium-low heat, stirring constantly, until custard is slightly thickened and coats the back of a spoon, about 18 minutes.
Remove from the heat. Stir in the vanilla, zest and nutmeg. Cool for 30 minutes, stirring occasionally.
In a small bowl, beat the cream and confectioners' sugar until stiff. Fold two-thirds into the custard. Layer custard and blueberries in parfait glasses. Garnish with remaining cream. Chill for 1 hour.