How to decode InformationElement in Dot11MgmtProbeReq

For 802.11 Beacon frames, I can use ```layer.(*layers.Dot11InformationElement)``` to get the IE, like this:

```
for _, layer := range packet.Layers() {
if layer.LayerType() == layers.LayerTypeDot11InformationElement {
dot11info, ok := layer.(*layers.Dot11InformationElement)
}
}
```

but for ProbeReq frames, ```layer.(*layers.Dot11InformationElement)```doesn't exist, I can only use ```
packet.Layer(layers.LayerTypeDot11MgmtProbeReq).(*layers.Dot11MgmtProbeReq)```
to get the Contents and Payload. It seems that the Information elements are in the Contents.

I'm new to golang, could you please give me an example of how to decode information elements in DOt11MgmtProbeReq, Thanks