I'm not sure what you mean by inherited... A packet comes in... And if the destination mates a VS, and if the VS has auto-last-hop enabled, then when the connection goes into the connection table, the inbound interface and src MAC is saved... There's no inheritance here...
VS's aren't really associated with a VLAN... There's no parent. There may be a VLAN that includes the VS IP address in the network that is configured on it (Depending on how you configure your bigip and your routing), but that's not used for ALH. It has no relationship...
H