qgis plugins - Set Snap Mode with PyQGIS

I am trying to set snap mode within QGIS plugin.

So far, I have tried:

QgsSnappingUtils().setSnapToMapMode(QgsSnappingUtils.SnapAdvanced)

and

QgsSnappingUtils().setSnapToMapMode(2)

without success.

QGIS Snapping options (Settings>>Snapping Options...) continue with: Snapping mode = Current layer

Any hint? (Using v 2.14.0)

Answer

I find a solution to that. As it seems to be impossible to access snapping mode from the QgsProject, I try to access it from the QgsInterface. This works for me in python Console:

from PyQt4.QtGui import QDockWidget, QDialog,QComboBox

iface.mainWindow().findChild(QDockWidget, 'Snapping and Digitizing Options').findChild(QDialog).findChild(QComboBox,'mSnapModeComboBox').setCurrentIndex(0) 

Change the current Index to fit to your needs: 0 = current layer 1 = all layers 2 = advanced

then you can set your snapping's settings with QgsProject.instance().setSnapSettingsForLayer(layer.id(),...)