What is "with_go"?

[Rio Tsutsumi]

I want to extract genes which have GO of "anatomical structure development" or its subcategory GOs.

I found there is "with_go" or "go" in the list of available filters and I am wondering what is "with_go"?

I tried

library(biomaRt)

db <- useMart("ensembl")

hg <- useDataset("hsapiens_gene_ensembl", mart = db)

res <- getBM(attributes = c("ensembl_gene_id", "go_id", "name_1006"),

filters = c("ensembl_gene_id_version","with_go"),    

values = list(genelist,"GO:0048856"=TRUE),

              mart = hg)

or 

library(biomaRt)

db <- useMart("ensembl")

hg <- useDataset("hsapiens_gene_ensembl", mart = db)

res <- getBM(attributes = c("ensembl_gene_id", "go_id", "name_1006"),

filters = c("ensembl_gene_id_version","go"),    

values = list(genelist,"GO:0048856"),

              mart = hg)

and I have got much more genes from "with_go". Does it retrieve all the genes with the GO and its subcategory?

Thank you

Rio