Protobuf message common attributes wrapper

Question

We have protobuf messages which share common attributes, for example

message Message1 {
    string foo = 1;
    string bar = 2;
    string baz = 3;
    string custom1 = 4;
}

message Message2 {
    string foo = 1;
    string bar = 2;
    string baz = 3;
    string custom2 = 4;
}

message Message3 {
    string foo = 1;
    string bar = 2;
    string baz = 3;
    string custom3 = 4;
}

message Message4 {
    string foo = 1;
    string bar = 2;
    string baz = 3;
    string custom4 = 4;
}

How can we have the common attributes defined in a separate proto file and be reused in all the messages.

message MessageCommonFields {
    string foo = 1;
    string bar = 2;
    string baz = 3;
}